Operation Manual – Port Mirroring
H3C S5500-EI Series Ethernet Switches
Chapter 1 Port Mirroring Configuration
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Chapter 1 Port Mirroring Configuration
When configuring port mirroring, go to these sections for information you are interested
in:
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Introduction to Port Mirroring
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Configuring Local Port Mirroring
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Configuring Remote Port Mirroring
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Displaying and Maintaining Port Mirroring
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Port Mirroring Configuration Examples
1.1 Introduction to Port Mirroring
Port mirroring allows you to duplicate the packets passing specified ports to the
destination mirroring port. As destination mirroring ports usually have data monitoring
devices connected to them, you can analyze the packets duplicated to the destination
mirroring port on these devices so as to monitor and troubleshoot the network.
Host
Data monitoring device
Network
Source
mirroring port
Destination
mirroring port
Figure 1-1
A port mirroring implementation
1.1.1 Classification of Port Mirroring
There are two kinds of port mirroring: local port mirroring and remote port mirroring.
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Local port mirroring copies packets passing through one or more ports (known as
source ports) of a device to the monitor port (also destination port) for analysis and
monitoring purpose. In this case, the source ports and the destination port are
located on the same device.
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Remote port mirroring implements port mirroring between multiple devices. That is,
the source ports and the destination port can be located on different devices in a
network. Currently, remote port mirroring can only be implemented on Layer 2.
